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Method for degrading lignin using visible-light response composite catalyst

A composite catalyst and visible light technology, which is applied in the field of effective utilization of lignin resources, can solve the problems of benzene ring damage and non-compliance, and achieve the effect of high benzene ring retention rate and simple and easy preparation method

Inactive Publication Date: 2015-10-14
NORTHEAST FORESTRY UNIVERSITY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In recent years, with the advancement of nano-catalysis technology, there have been many studies on the use of ultraviolet light-assisted nano-catalysts to degrade lignin. However, due to the serious damage to the benzene ring of lignin due to this activation method, it does not meet the requirements of the biomass energy conservation and utilization strategy. The idea of ​​conversion of raw materials into fossil energy alternatives

Method used

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  • Method for degrading lignin using visible-light response composite catalyst
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  • Method for degrading lignin using visible-light response composite catalyst

Examples

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example 1

[0023] Mix 1g of refined lignin, 100mL of distilled water, 20mL of n-butanol, 0.020g of dimethyl ether quinoline squaraine (see attached figure 1 ), 0.0500g nano-TiO 2 (The particle size of the photocatalyst is 2nm~50nm) Avoid light and ultrasonically disperse for 20min, then irradiate with sunlight for 6h; after the reaction, let stand for 2h, then centrifuge at 8000rad / min at high speed, wash 3 times with distilled water, and the solid residue is degraded Lignin Ⅰ was then dissolved in alkali and acid-precipitated to obtain flocculent precipitates, and dried in vacuum at 80°C with a yield of 63.12%; DPPH free radical (1,1-diphenyl-2-trinitrobenzene Hydrazine, see attached Figure 4 ) Determination of antioxidant capacity: IC of lignin 50 (required concentration to remove 50% of DPPH free radicals) value is 0.199mg / mL; degraded lignin Ⅰ has higher antioxidant ability to DPPH free radicals than original lignin, and its IC 50 The value is 0.127mg / mL; compared with the common...

example 2

[0028] 1g refined lignin, 100mL distilled water, 20mL n-butanol, 0.02g ruthenium complex N3 dye [chemical name: CIS-dithiocyanatobis(N,N'-2,2'-bipyridine-4,4 '-diformic acid) ruthenium] (see attached figure 2 ), 0.0500g nano-TiO 2 (The particle size of the photocatalyst is 2nm~50nm) Avoid light and ultrasonically disperse for 20min, and then irradiate with sunlight for 6h; centrifuge after the reaction, discard the supernatant, and wash the remaining solid twice with an appropriate amount of distilled water; then dissolve in alkali, acid A flocculent precipitate was obtained, and after centrifugation, washing, and drying, the degraded lignin II was obtained with a yield of 45.82%; the degraded lignin II was subjected to DPPH free radical (1,1-diphenyl-2-trinitrophenylhydrazine, See attached Figure 4 ) Determination of antioxidant capacity: IC of lignin 50 (required concentration to remove 50% of DPPH free radicals) value is 0.199mg / mL; degraded lignin II has higher antioxid...

example 3

[0032] Mix 1g refined lignin, 100mL distilled water, 20mL n-butanol, 0.02g tetracarboxylic cobalt phthalocyanine (see attached image 3 ), 0.0500g nano-TiO 2 (The particle size of the photocatalyst is 2nm~50nm) Avoid light and ultrasonically disperse for 20min, and then irradiate with sunlight for 6h; centrifuge after the reaction, discard the supernatant, and wash the remaining solid twice with an appropriate amount of distilled water; then dissolve in alkali, acid A flocculent precipitate was obtained, and after centrifugation, washing, and drying, the lignin activation product III was obtained with a yield of 48.82%; the degraded lignin III was subjected to DPPH free radical (1,1-diphenyl-2-trinitrophenylhydrazine , see attached Figure 4 ) Determination of antioxidant capacity: IC of lignin 50 (required concentration to remove 50% of DPPH free radicals) value is 0.199mg / mL; degraded lignin Ⅲ has higher antioxidant ability to DPPH free radicals than original lignin, and i...

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Abstract

The invention discloses a method for degrading lignin using a visible-light response composite catalyst. The method comprises the following steps: attaching a visible-light response photosensitizer to the surface of a nano catalyst; and through interfacial electron transfer action, transferring the excited electrons generated by a visible-light excitation composite catalyst to the conduction band of the nano catalyst to form active substances such as superoxide radicals or superoxide anions on the surface of the nano catalyst, wherein the active substances generate an activating reaction with lignin to remove methoxy group in the phenyl propane structure unit of lignin and increase the hydroxyl value of lignin. The method disclosed by the invention has the following advantages: the benzene ring retention rate of the activation product is high; compared with the high-pressure catalytic hydrogenation degrading method, the technology can be performed at normal temperature under normal pressure, and the equipment cost as well as the energy consumption in the degrading process are reduced; and compared with the lignin enzymolysis method, the production cycle of the technology is short, and the cost is low. The highest content of total hydroxyl of the alkali lignin activation product can be increased by about 147wt% over the alkali lignin before degradation.

Description

technical field [0001] The invention belongs to the field of effective utilization of lignin resources, and relates to a visible light-responsive composite catalyst to depolymerize lignin, reduce its molecular weight, increase lignin hydroxyl value and reactivity, expand the use of lignin in industrial production, and make it a viable Partially replacing polyether polyol materials, the invention belongs to the technical method of natural polymer modification. Background technique [0002] In the industrial production of cellulose (such as textiles, pulp and paper, wood hydrolysis, biomass materials, biomass energy, etc.), lignin is mostly discharged as waste. The world discharges 150 to 180 million tons of industrial lignin every year, most of which are used as heat sources, and only 1 to 2% (mainly lignosulfonates) are reused as organic chemical resources. In developed countries, wood is used as raw material for papermaking, and more than 50% of industrially degraded ligni...

Claims

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Application Information

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IPC IPC(8): C08H7/00
Inventor 马艳丽张盛明方桂珍王海登杨正美
Owner NORTHEAST FORESTRY UNIVERSITY
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